GENERAL DESCRIPTION

The AD9853 integrates a high speed direct-digital synthesizer (DDS), a high performance, high speed digital-to-analog converter (DAC), digital filters and other DSP functions onto a single chip, to form a complete and flexible digital modulator device. The AD9853 is intended to function as a modulator in network applications such as interactive HFC, WLAN and MMDS, where cost, size, power dissipation, functional integration and dynamic performance are critical attributes.

FEATURES

Universal Low Cost Solution for HFC Network

Return-Channel TX Function: 5 MHz–42 MHz/5 MHz–65 MHz

165 MHz Internal Reference Clock Capability

Includes Programmable Pulse-Shaping FIR Filters and Programmable Interpolating Filters

FSK/QPSK/DQPSK/16-QAM/D16-QAM Modulation Formats

6x Internal Reference Clock Multiplier

Integrated Reed-Solomon FEC Function

Programmable Randomizer/Preamble Function

Supports Interoperable Cable Modem Standards

Internal SINx/x Compensation

>50 dB SFDR @ 42 MHz Output Frequency (Single Tone)

Controlled Burst Mode Operation

+3.3 V to +5 V Single Supply Operation

Low Power: 750 mW @ Full Clock Speed (3.3 V Supply)

Space Saving Surface Mount Packaging

APPLICATIONS

HFC Data, Telephony and Video Modems

Wireless LAN